Thermostat for domestic water boilers



Feb l2, w29. Y L7253 c. H. MoRRow THERMOSTAT ITOR DOMESTIC WATER BOILERSI Filed May 23, 1927 72 /7 /z b "U /5 Patented Feb. 12, 1929,.

UNITED STATES 1,702,053 PATENT OFFICE.

CLARENCE H. MORIR/0W, 0F CLEVELAND, OHIO, ASSIGNOR TO THE HOTSTIREAMI IEATER COMPANY, 0F CLEVELAND, OHIO, A CORPORATION OF OHIO.

THERMOSTAT FOR DOMESTIC WATER BOILERS.

. Application filed May 23,

rlhis invention relates to thermostatic devices and particularly to that class employing a tubular heat responsive element adapted to lproject into a boiler or jacket for regulating the fuel to the heater for heating water for a domestic boiler. v

Heretofore, in devices of this character, the heat responsive element has been in the form of a tube of some length encasing a non-expanding element and both mounted in a suitable thermostat body adapted tobe secu'red in the boiler or other casing and receivin a suitable gas valve operating mechanism `01' controlling the gas supply. This valve mechanism, in some instances, has included a lever, and in all of these arrangements it has been diilicult to house a lever of the proper length for maximum operation without rendering the thermostat body unduly large and un. wieldy.

The present invention, therefore, conteurplates the production of a minimum sized thermostat of this type including lever mechanism extending into, and in one arrangement co-extensive with, the. heat responsive element whereby long leverage and maximum valve opening are obtained without unduly increasing the size of the thermostat'body.

Other features of the invention will beapparent from the following description, drawings and claims.

In the drawings, Fig. 1 is a vertical section through the device; Fig. 2 is a section upon line 2 2, Fig. 1; Fig. 3 isla detail view oia non-expanding pencil support; Fig. 4: is a top plan View of thelever; Fig. 5 is a bottom plan view of the lever; and Fig. 6 is a section upon the line 6-6, Fig. 1. v

In the embodiment shown, l represents a thermostat bodyV having" a hollow threaded shank 2 forming a fitting for attachment inV a boiler or other casing. The thermostat bod 1, in alignment with the opening of the sha 2, is provided with a threaded opening 6 adapted tov receive an adjusting screw 7 forma purpose to bedescribed. A suitable cap 8 1s threaded on to a reduced shank 9 of this plug V5 to` seal oit the adjustment. Preferably integral with the thermostat body 54 is a valve body 10 having a valve seat 11 therein separating the inlet chamber 12 from the outlet chamber 13. Suitable by-pass orts 14 lead to a threaded opening 15. A p ug 16 is arranged in this opening 15 and these parts serve as a pilot by-pass from one side of the 1927. Serial No. 193,567.

valve to the other. Cooperating with the valve seat is a valve 17 provided with a central boss 18 having an opening 19 therein. Engaging the boss 18 is a spring 20 forced down by a cap 2l`secured to the valve body. The inner wall of the opening 19 is engaged by a pin 22 extending down through a suitable guide Vand partition 23 and into the chamber 3 in ,the thermostat body. This pin engages 'the lever mechanism to be described.

Threaded into the thermostat body is the -heat responsive element or tube 24 of a suitable length to give the desired amount of thermostatic movement. The end of this tube 24-is closed by a plug or abutment 25 soldered in place and prevented from endwise movement out of the end of the tube` by peening the edge of the tube as at 26. Engaging the plug 25 is a fulcrum projectiony 27 forming a part of a lever cap 28 carrying a lever 29 trough shape in cross section and tapering.

cal seat 31 adapted to receive a pencil cap- 32 arranged upon the end of a non-expanding pencil 33. Toinsure the cap 32 remaining in engagement with the seat a su1table opening 34 is provided in the sides of the lever and a pin 35 extends through these openings and isanchored inthe cap 32. The non-expandL ing pencil 33, at. itsyopposite end, is provided with another cap 36 also provided with an vopening 37 for receiving a pin 36a extending into openings 37 in a pencil support 38. This pencil support is in the form of a channel with sides anda solid back 39 and with upper openings 40 near its lower end and at the back 39 -for lthe reception of a pivot pin 41 arranged in the thermostat body. The sidesv of the channel vshaped pencil support engage the sides of the end of the lever 29 and maintain itin proper operating position. When the parts are properlyproportioned and mounted the solid back 39 of the pencil support engages the adjusting'screw 7 The apparatus is used' and applied by screwing the threaded connection 2, of the ing the heat responsive tube 24 is at a low temperature, th'e parts are arranged and adjusted by the screw 7 so that the valve lever is in the thermostatic body, into a tank. or l casing which is in circulatory communication with the 'water or other liquid to be heated by the heater.v The fuel is then supplied tothe inlet 12 of the valve body. If the liquid surroundposition shown in Fig. 1 and the valve is held' .open and fuel is supplied to the burner of the heater. As the temperature of the liquid Surrounding the tube 24 rises to the point 'where the thermostat is adjusted by the screw 77 the tube 24 -expands and causes the valve lever to moveclockwise, as shown in the draw..-

ings, and the fuel valve seats, thus shutting oli' the main supply of fuel to the burner and merely permitting a by-pass around the valve for pilot purposes. When the temperature surrounding the tube 24 drops the.reverse operation takes place.V In this way the temperature of the liquid is controlled andfheld at the desiredpoint. If the'user wishes to raise or lower the temperature he -may accomplishthis result by adjusting the screw 7 Y which changes the functioning of the nonexpanding pencil 23 and produces thecchange in the temperature. j I. V

By the arrangement disclosed in l this case a long valve operating lever may be'used to' great advantage in obtaining a large opening n of the gas valve, thereby permitting reduction in the size of the gas valve and the accompaying parts. What I claim is: 1. A thermostat for apparatus of the class described, comprising a gas valve body having a valve seat and valve therein,a tubular heat responsive 'thermostatic' element anchored in said body and communicating therewith, an abutment in the outer' end of-said tubular element/a.Jion-expanding element l having a rounded end and a relatively xed abutment at the valve body end thereof and projecting into and towards thc end of said tubular element, and a bell crank lever fulcrumed on said non-expanding element and engaging said abutment .of the thermostatic v'element and provided with a socket for receiving the rounded end of the non-expandiingrelement, and a-long lever arm extending Y through the tubular element and into the gas valvebodywhere it engages the valve.

2. As in claim l wherein the non-expanding element is provided with a rounded end and the short arm of the lever is provided with a socket for receiving said rounded end,V and means for loosely coupling the rounded end of the'non-expandingelement to the lever to insurer proper engagement.

3. A thermostatffor apparatus of the class described, comprising a gas valve body havand a relatively long arm extending through the element into the valve body, and abutment means for the non-expanding element comprising a lever fulcrumed in the gas body and loosely connected to said non-expanding element, and means for adjusting the movement of said abutment lever.

4. A thermostat as in claim 3 wherein the means for adjusting the abutment lever comprises a screw extending through the gas valve body.

5. A thermostat-asin claim 3 wherein the abutment lever is provided with anges embracing the end of the-non-expanding element and the end of thelong lever arm for maintaining them in operative position and for guiding the lever arm into proper engagement wi th the valve of the gas body.

In testimony whereof I hereby affix my signature.N

CLARENCE H. MORROW. 

